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Controller Methods and Input Parameters
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What about any input data that must be passed on to a controller s method Any accessible input data is any data posted with the HTTP request. The ASP.NET MVC runtime groups any input data in a single container the parameters dictionary. The dictionary is made available to any controller instance through a public property.
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4 Inside Controllers
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When writing the body of an action method, you can certainly access any available input through the familiar Request object and any of its child collections, such as Form, Cookies, ServerVariables, and QueryString. However, the ASP.NET MVC runtime environment also offers another interesting feature automatic parameter resolution. If you specify a parameter list in the signature of the action method, ASP.NET MVC attempts to match those parameter names to members of the parameters dictionary. I ll return to input parameters for action methods later as we delve deeper into the anatomy of controllers. Note Automatic parameter resolution is free of charge as long as you adhere to the Convention-over-Configuration (CoC) paradigm. In practical terms, parameter resolution works automatically only if you can guarantee that the name of each formal parameter in an action method matches any of the element names in the parameters dictionary. The match is case insensitive. When you violate the convention, parameter resolution more often referred to as model binding is still possible but requires you to do some work on your own. Precisely, it requires you to write a custom model binder component. (I ll cover model binding in detail in 6, Inside Models. )
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Anatomy of an ASP.NET MVC Controller
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The role of the controller is central to the architecture of ASP.NET MVC. For this reason, a controller class is expected to have a fixed structure and provide some well-defined characteristics. As a developer, though, when you write a new controller class you are actually absolved from fulfilling many of these requirements yourself. Developers writing a controller class are simply required to define a public class with a few public methods. This controller class, however, must derive from a mandatory base class the Controller class. In turn, the Controller class derives from a base class that implements a given interface. Let s take the plunge into the internal structure of ASP.NET MVC controllers.
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Inside the Structure of a Controller
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The primary responsibility of a controller is executing any task associated with the incoming request. Around this key responsibility, a number of other features are built. In the end, a controller has quite a layered structure, as illustrated in Figure 4-4.
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Part II The Core of ASP.NET MVC Your Controller class here Other interfaces IActionFilter, IAuthorizationFilter, IExceptionFilter, IResultFilter ControllerBase class IController interface
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FIGuRE 4-4 An interior view of a controller class
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Controller class
Let s start with the IController interface.
The IController Interface
The IController interface has a precise, single responsibility: executing the specified request context. A request context is the ASP.NET MVC abstraction that encapsulates information about the HTTP request that matches a defined route. Admittedly, the purpose of the interface couldn t be clearer. A controller is expected to receive an HTTP request that matches any of the routes your application supports and execute it. Here s the definition of the interface as it appears in the System.Web.Mvc assembly. (The namespace of the interface is also System.Web.Mvc.)
public interface IController { void Execute(RequestContext requestContext); }
The RequestContext object is defined in the System.Web.Routing assembly as follows:
public class RequestContext { public RequestContext(HttpContextBase httpContext, RouteData routeData); public HttpContextBase HttpContext { get; internal set; } public RouteData RouteData { get; internal set; } }
As you can see, the context of an HTTP request is identified by the ASP.NET HttpContext object, and any data (controller name, method name, and optionally parameters) is extracted from the route. Important You should note the use of the ASP.NET MVC HttpContextBase class instead of the
ASP.NET native HttpContext class. This is done to decouple the controller from the ASP.NET infrastructure for testing purposes. Essentially, HttpContextBase serves as the base class for classes that contain HTTP-specific information about an individual HTTP request.
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